Tim Gieseke is an EcoCommercist. He defined the term to describe the application of ecological economic principles at the practitioner and market levels. Commerce is a social activity at the micro-economic level. EcoCommerce is the social activity at the nexus of economic and ecological systems. EcoCommerce is rooted in oikos, the root word of ecos or house. Oikos recognizes the common connection between economic houses and ecological houses. Oikos is real and EcoCommerce reveals this connection in a tangible manner to meet people's self-interests and society's collective interests.